8724 V Tribrid NVR Installation Guide
22
Feature Overview
Alarm and Switch Terminals
There are alarm and switch terminals on the main circuit board inside the unit (see “Main
Circuit Board” on page 21). Alarm and switch devices can connect to these.
Connecting an Alarm or Switch Device
Using the following procedure, you can connect alarm and switch devices to the terminals at the
back of the unit.
Note:
End-of-Line (EOL) resistors are not supported. Only Open and Closed states are monitored.
To connect an alarm or switch device
1
Ensure the unit is powered down and the LEDs at the front of the unit are off.
2
Locate the appropriate alarm or switch terminals (refer to the graphic above).
3
Attach the device to the appropriate terminals:
For alarm devices:
•
Use the G (ground) terminal when connecting the common wire.
Note:
The alarm input is open/short, dry contact only.
For switch devices:
•
Connect the switch device common wire to the common (C) terminal.
Note:
The maximum voltage for a connected switch device is 60 volts DC input at 1 Amp.
Anything above 60 volts must be handled by a second-stage relay control circuit, approved
and validated by certified electrician.
•
Depending on the switch’s default state, connect the normally-open or normally-closed
wire to the normally-open (NO) or normally-closed (NC) terminal, respectively.
After you connect the alarm and/or switch devices, you can turn on the unit.
Alarm and switch terminals
Pinout
Main circuit board
in unit
Terminal
block
